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Table 1 Equations of color indices measured

From: Analysis of canopy phenology in man-made forests using near-earth remote sensing

Color index

Equation

References

Ratio greenness index

\(GGR=G/R\)

[19]

Green chromatic coordinate

\(GCC=G/(R+G+B)\)

[20]

Green excess index

\(GEI=2G-(R+B)\)

[20]

Red chromatic coordinate

\(RCC=R/(R+G+B)\)

[21]

Green red vegetation index

\(GRVI=(G-R)/(G+R)\)

[22]

Hue

\(HUE=(B-R)/({I}_{max}-{I}_{min}) x60+120\)

\(G={I}_{max}\)

\(HUE=(B-R)/({I}_{max}-{I}_{min}) x60+240\)

\(B={I}_{max}\)

\(HUE=(G-B)/({I}_{max}-{I}_{min}) x60+340\)

\(G<B\)

\(HUE=(G-B)/({I}_{max}-{I}_{min}) x60\)

other

[23]

  1. R, G, and B represented the brightness of red, green, and blue channel, respectively; \({\mathrm{I}}_{\mathrm{max}}\) and Imin represented the maximum and minimum of R, G and B, respectively